README

WP DI

PHP Dependency Injection for WordPress (based on Pimple)

This is nothing new but we added some magic:

• Compatible with projects using Pimple already
• Configuration via plain arrays, Yaml or other
• "Less WordPress more OOP"

and still searching for other magic to apply.

Getting started

Add the package to your project

composer require rmp-up/wp-di

and set up the container provider

RmpUp\WpDi\WpDi::load( require 'services.php' );

$container = \RmpUp\WpDi\WpDi::pimple();

Friends of YAML can add composer require symfony/yaml and use

RmpUp\WpDi\WpDi::load(
	RmpUp\WpDi\Yaml::parseFile( 'services.yaml' )
);

Features

A full documentation can be found in the documentation of the latest releases. The following is just a sneak peek into some of the possibilities. Try using the "preload.php" when you have PHP >= 7.4 or a composer workflow to get even more performance:

{
  "autoload": {
    "files": [ "vendor/rmp-up/wp-di/preload.php" ]
  }
}

Services and parameters

Define services as known from classical DI but also ...

• Primitive parameters as usual
• Default values for options
• Path to templates
• Inject all of them into services
• Allow factories to create services

# Primitive parameters as usual
parameters:
  some: "primitives"
  like: 42

# Default values for options
options:
  _my_plugin_rating: 5/7
  _this_is: cool

# Path to templates
templates:
  admin-view: my-own-plugin/template-parts/fester.php
  frontend-view: my-own-plugin/public/coogan.jpg
  # looks up the file in theme, theme-compat and plugin directory

# Inject all of them into services
services:
  SimpleOne:
    arguments:
      - "Hello there!" 
      - 1337
 
  SomeThing:
    arguments:
      - "%like%" # the parameter
      - "%_this_is%" # the option
      - "%frontend-view%" # path to the template
      - "@SimpleOne" # the other service

Register services in WordPress

Services can also be used to ...

• Add actions / filters
• Add Meta-Boxes
• Register Post-Types
• Register Shortcodes
• Register Widgets
• Add WP-CLI commands

services:
  StrrevEverything:
    filter: the_content
    # calling `::__invoke` for the "the_content"-filter

  BackendAdminListThing:
    meta_box:
      title: Greatest box in the World!
      screen: post

  MyOwnPostType:
    post_type: animals
    # cast service to array and forward to register_post_type

  BestShortcodeEver:
    shortcode: shortcode_wont_die
    widget: ~
    # Shortcode and widget at once. Wow!

  DoItCommand:
    wp_cli:
      do-it: __invoke
      doit: __invoke
      seriously do-it do-it do-it: seriously
      # cli commands mapped to methods 

Use tags to enhance YAML

Within YAML you can:

• Access PHP-Constants
• Concatenate text
• Translate text

Mostly lazy to get the best performance.

services:
  # Access PHP-Constants
  InjectingConstants:
    arguments:
      - !php/const ABSPATH

  # Concatenate text
  ThisIsSomeTemplate:
    arguments:
      - !join [ !php/const WP_CONTENT_DIR, "/plugins/grey-matter/walter.jpg" ]

  # Translations within YAML
  ThisThingNeedsTranslations:
    arguments:
      - !__ [ Who is Adam?, dark ]
      - !esc_attr__ [ white ]
      # ... many more translation functions available ...

All of this is only possible when using \RmpUp\WpDi\Yaml::parseFile(...) or ::parse(...).

Contributing

We used this in some projects and still maintain/enhance it, so please open an issue if there is anything we can help with.

If you'd like to contribute, please fork the repository and make changes as you'd like. Pull requests are warmly welcome.

Related projects

Please also note the following projects about dependency injection container in WordPress:

• Pimple Dependency Injection Container
• Plugin-Boilerplate by Gary Jones

Licensing

See the LICENSE.txt for details.